> ## Documentation Index
> Fetch the complete documentation index at: https://developers.tassyir.io/llms.txt
> Use this file to discover all available pages before exploring further.

# OFFER_CODE_INVALID

> HTTP 400, from POST /offers/{id}/codes.

Its problem `type`: `https://developers.tassyir.io/errors/offer-code-invalid`; its `title`: Bad request.

## What to do

Send a code of 3 to 30 characters: letters, digits, hyphens and underscores.

## Answered by

HTTP 400, from:

* [`POST /offers/{id}/codes`](/api-reference/admin/offers/add-a-code-to-an-offer)

The shape of every problem, and how `@tassyir/app` reports it: [Errors](/guides/errors).


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